Boiler-flue.



PATENTED JUNE 11, 1907.

J. H. DAVENPORT.

BOILER PLUE. APPLICATION FILED AUG. 20, 1906.

WITNESSES WZ fNl E/VTOR.

A TTOR/VE Y5 1 beaded at their outer end as shown at 6 so as.

to be held in adjoining en screw threaded externally as at 7 and project into and engage a sleeve 8 which serves to hold them to ether without leaking.

esired to construct a 'boiler' sheet from corroding; with flues of the character described, a suitunderstood that instea able furnace is prepared ready-to receive the rear. flue sheet. The flue stubs are then threaded at their inner end portions and'insertedinto the flue openings in the rear flue sheet and then rolled and expanded to form beads 5 of the usual form.

UNITED STATES PATENT orrron.

To aZZ whom it may concern:

Be it known that I, JOHN H; DAVENPORT, a citizen of the United States, residing at Grand Island, in the county of Hall and State of Nebraska, have invented a new and s read over t useful Boiler-Flue,-of which the following is a s eet. specification.

This invention relates to boiler flues and to the :method of securing them to the flue sheets.

The object of the invention is to provide a be found to b sectional flue one section of which is formed of an integral part of the rear flue sheet and upon the boiler. in addition thereto is retained by. the usual bead. The adjoining ends of the sections of the flue are threaded so as to be easily secured together without danger of leaking. mg stubs 2 by me With the above and other objects in view the invention consists of certain novel features of "construction and combinations of parts which will behereinafter more fully described and pointed out in the claims.

Inthe accompanying drawings is shown the preferred form'of the invention.

In said drawings: Figure 1 is a section through a boiler and showing the flues in position therein; Fig. 2 is an enlarged section showing the connections between the flues and flue-sheets; and Fig. 3 is a section showing a's'tp 'inthe rocess of welding the flue stubs to theback ue sheet;

Referring to the figures by characters of reference, 1 is the backflue sheet of a boiler from which extend short flue stubs 2 of different lengths. The front flue sheet 3 of the flue sheet is reinf boiler has long flue sections 4 secured thereto and disposed in alinement with and s cured to the stubs 2. the rear fluefsheet andbeaded as shown at 5 and the main flue sections 4 are rolled and joints between the flue entirely within the boiler and will not thereplace in the usual manner. The fore be affected by the heat because on When it is stubs have been placed in proper position the flue sheet said sheet is placed in a without depart gether.

Said stubs are brazed 'within s of the stubs -2 and flues 4 are After all of the Specification of Letters Patent. Application filed August 20, 1906. Serial No. 331,338.

horizontal position wi around the outer edge then poured around each crevices and a After the spelter in this manner the entire stubs therein is placed'wi the spelter thoroughly sheet can then be removed and the stubs will e securely brazed in position. an then be lifted in place The main flue sections 4 are then inserted through the front flue sheet and, beginning at the said sections 4 are coup ans. of

serve to hold the flu Said flue sheet 0 the coupling sle said flues being placed 0 circulation of water around the flues adjacent t be interfered with. tions 4 have all been seds thereof are rolled and the couplings will no After the flue sec cured the outer en expanded to form the beads 6.

By assembling the parts of a furnace in the described the flues are renindestructible as far as the manner herein dered practically effect of the heat the cause the stubs are formed gral with the rear flue "sheet and therefore absolutely the brazed connection orce should the brazing defective the bead efficient in .preve ordinarily ,used

nting for that purpose.

sections are disposed sheet it serves of the flue' -sections int tions can screw one into the other or various connections can be utilized. d form of the invention has in the foregoing description; but I do not limit myself thereto, as I .am aware that modifications may be made therethe spirit or sacriother threaded The preferre been set forth g from JOHN H. DAVENPORT, or GRAND ISLAND, NEBRASKA.

Patented June 1 1, 1907.

th a bank 9 of fire clay thereof. Spelter 10 is flue so as to fill the ortion of the spelter will also e inner surface of the flue has been distributed flue sheet with the thin a furnace and melted. The flue reon is concerned bepractically inteleakage is prevented. Moreover, between the stubs and d by the heads 5 and of any one of the stubs be of said stub would be as leakage as the beads The tirely surrounded by the water withm the boiler. The spelter thoroughly the boiler and as it covers the rear flue seals the rear end of the inner surface of to prevent said It will of course be d of screwing the ends o a sleeve said secbottom of the boiler,- led to the correspond the sleeves 8 which e sections securely to- As the stubs are of different lengths eves 8-will not interfere with lose together and the ficing the advantages thereof, and I there.- fore reserve the rig t to make such changes v as fairly fall Within the scope of theclaims.

. What is claimed is:

A boiler comprising front and rear flue sheets, stubs extending through the rear flue sheet, the outer ends of said stubs having beads thereon overlapping the walls of the openingsfiin the flue sheet, a layer of non-corrodible metal disposed upon and covering the inner face of the rear flue sheet and surrounding the stubs and constituting a solder, main fluesections Within the front flue sheet, and means between and spaced vfro-In the flue sheets for coupling together the inner face of the main flue sections and the stubs. v

- In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

JOHN H. DAVENPORT.

Witnesses:

PHIL. KOEPLIN, JOHN Pmmsnu. 

